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Jonathan Wakely 0cb78ef4bc Define std::hash specializations for C++17 PMR strings 
These hash specializations should have been added when the pmr::string
and related typedefs were added.

	* include/std/string (__hash_string_base): New class template defining
	operator() for hashing strings.
	(hash<pmr::string>, hash<pmr::u8string>, hash<pmr::u16string>)
	(hash<pmr::u32string>, hash<pmr::wstring>): Define for C++17.
	* testsuite/21_strings/basic_string/hash/hash.cc: New test.
	* testsuite/21_strings/basic_string/hash/hash_char8_t.cc: New test.

From-SVN: r270116
 		2019-04-03 10:47:47 +01:00
..
basic_string Define std::hash specializations for C++17 PMR strings 2019-04-03 10:47:47 +01:00
basic_string_view PR libstdc++/89446 fix null pointer dereference in char_traits 2019-02-23 03:01:59 +00:00
c_strings Update copyright years. 2019-01-01 13:31:55 +01:00
char_traits/requirements P0482R5 char8_t: Updates to existing standard library tests 2019-02-22 01:16:08 +00:00
debug Update copyright years. 2019-01-01 13:31:55 +01:00
headers P0482R5 char8_t: Updates to existing standard library tests 2019-02-22 01:16:08 +00:00